From a Germanic language; compare Proto-Germanic *hulmaz (“small island, hill, mound”). The exact donor language cannot be specified - some form of Germanic that had not undergone the a-umlaut, possibly Langobardic or Gothic.
The Germanic word further reflects Proto-Indo-European *kelH- (“lift”), whence also *čelo (“forehead”).
*xъ̃lmъ m[1]
singular | dual | plural | |
---|---|---|---|
nominative | *xъ̃lmъ | *xъlmà | *xъlmì |
genitive | *xъlmà | *xъlmù | *xъ̃lmъ |
dative | *xъlmù | *xъlmòma | *xъlmòmъ |
accusative | *xъ̃lmъ | *xъlmà | *xъlmỳ |
instrumental | *xъlmъ̀mь, *xъlmòmь* | *xъlmòma | *xъ̃lmy |
locative | *xъlmě̀ | *xъlmù | *xъ̃lměxъ |
vocative | *xъlme | *xъlmà | *xъlmì |
Vasmer, Max (1964–1973) “холм”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress